The origin of chemical inhomogeneity in lead-free potassium sodium niobate ceramic: Competitive chemical reaction during solid-state synthesis
The origin of chemical inhomogeneity in lead-free potassium sodium niobate ceramic: Competitive chemical reaction during solid-state synthesis
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无铅铌酸钾钠陶瓷化学不均匀性的根源：固态合成过程中的竞争化学反应
DOI：
10.1016/j.actamat.2021.116833
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发表时间：
2021
期刊：
影响因子：
9.4
通讯作者：
Wang, Ke
中科院分区：
文献类型：
--
作者：
Thong, Hao-Cheng;Payne, Alexis;Li, Jia-Wang;Cheng, Yue-Yu-Shan;Jones, Jacob L.;Wang, Ke
在过去 15 年里，无铅铌酸钾钠 (KNN) 基压电陶瓷具有优异的机电性能。然而，由于缺乏对某些加工方面的充分了解，KNN 机电性能的再现性差一直是工业发展的主要障碍。化学不均匀性是加工过程中最关键的挑战之一，因为 KNN 基陶瓷的性能强烈依赖于成分。在本研究中，采用原位温度依赖性X射线衍射和热重分析来研究固态合成过程中发生的化学反应。发现化学均质性对合成过程中反应物之间的竞争敏感。这种现象可以合理地解释 KNN 以及其他可能通过固态合成制备的无铅压电陶瓷系统中的化学不均匀性。
Excellent electromechanical properties have been reported in lead-free potassium sodium niobate (KNN)-based piezoelectric ceramics over the past 15 years. However, poor reproducibility of the electromechanical properties of KNN has been a major barrier to industrial development, due to a lack of full understanding of some of the processing aspects. Chemical inhomogeneity is one of the most critical challenges in processing, as the properties of KNN-based ceramics are strongly composition-dependent. In the present study,in-situtemperature-dependent X-ray diffraction and thermogravimetric analysis were employed to investigate the chemical reactions that occur during solid-state synthesis. Chemical homogeneity was found to be sensitive to the competition among reactants during synthesis. The phenomenon can reasonably explain the chemical inhomogeneity in KNN and possibly other lead-free piezoelectric ceramic systems prepared via solid-state synthesis.
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影响因子：
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